646913 has 2 divisors, whose sum is σ = 646914. Its totient is φ = 646912.

The previous prime is 646909. The next prime is 646927. The reversal of 646913 is 319646.

646913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 552049 + 94864 = 743^2 + 308^2 .

It is a cyclic number.

It is not a de Polignac number, because 646913 - 2² = 646909 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646913.

It is not a weakly prime, because it can be changed into another prime (646993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323456 + 323457.

It is an arithmetic number, because the mean of its divisors is an integer number (323457).

2⁶⁴⁶⁹¹³ is an apocalyptic number.

It is an amenable number.

646913 is a deficient number, since it is larger than the sum of its proper divisors (1).

646913 is an equidigital number, since it uses as much as digits as its factorization.

646913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 29.

The square root of 646913 is about 804.3090202155. The cubic root of 646913 is about 86.4865605547.

The spelling of 646913 in words is "six hundred forty-six thousand, nine hundred thirteen".